Collect. Czech. Chem. Commun. 1976, 41, 271-284
https://doi.org/10.1135/cccc19760271

Oxidation of 21-oxo-20β,28-epoxy-18α,19βH-ursane derivatives; Unusual reactivity of oxabicyclo[2,2,1]heptane system in ring E

E. Klinotová, J. Beneš, J. Vokoun and A. Vystrčil

Individual author index pages


Other CCCC articles of these authors

  • J. Volc, P. Sedmera, K. Roy, V. Šašek and J. Vokoun
    Two antibiotic benzoquinone-hydroquinone pairs from the pyrenomycete Camarops microspora (KARST.) SHEAR
    1977, Vol. 42, Issue 10, pp. 2957–2961 [Abstract]
  • F. Tureček and A. Vystrčil
    The synthesis of (3-2H)tricyclo[6,2,2,O2,7]-3,9-dodecadiene
    1977, Vol. 42, Issue 8, pp. 2408–2414 [Abstract]
  • V. Pouzar and A. Vystrčil
    Preparation of derivatives of 29-hydroxy-30-norlupan-20-one
    1977, Vol. 42, Issue 7, pp. 2224–2230 [Abstract]
  • J. Protiva, M. Buděšínský and A. Vystrčil
    Unusual course of photolysis of 3β-acetoxy-28-nitrosyloxylupane. Synthesis of triterpenic N-oxides and hydroxamic acids
    1977, Vol. 42, Issue 4, pp. 1220–1228 [Abstract]
  • J. Beneš, V. Beránek, J. Zimprich and P. Vetešník
    Kinetics of splitting and deprotonation equilibria of monosubstituted and symmetrically disubstituted diaryltriazenes
    1977, Vol. 42, Issue 2, pp. 702–710 [Abstract]
  • J. Protiva, F. Tureček and A. Vystrčil
    Revised structure of thurberine. Synthesis of 3,12-lupanedione
    1977, Vol. 42, Issue 1, pp. 140–150 [Abstract]
  • V. Pouzar and A. Vystrčil
    Reduction and steric interaction of 12-lupanone derivatives
    1976, Vol. 41, Issue 11, pp. 3452–3466 [Abstract]
  • J. Beneš and J. Hetflejš
    Asymmetric hydrosilylation of ketones
    1976, Vol. 41, Issue 8, pp. 2264–2272 [Abstract]
  • J. Beneš and J. Hetflejš
    Synthesis of some phosphines containing chiral substituents
    1976, Vol. 41, Issue 8, pp. 2256–2263 [Abstract]
  • J. Protiva, V. Pouzar and A. Vystrčil
    Mass spectra of 12-oxolupane derivatives
    1976, Vol. 41, Issue 8, pp. 2225–2237 [Abstract]
  • J. Vokoun, E. Klinotová and A. Vystrčil
    Mass spectrometric fragmentation of triterpenoid derivatives with oxabicyclooctane and oxabicycloheptane ring E arrangement
    1976, Vol. 41, Issue 5, pp. 1590–1597 [Abstract]
  • F. Tureček and A. Vystrčil
    The syntheses of 7-alkyl derivatives of bicyclo[4,3,0]-3-nonenes
    1976, Vol. 41, Issue 5, pp. 1581–1589 [Abstract]
  • F. Tureček and A. Vystrčil
    The syntheses of 8-alkyl derivatives of bicyclo[4,3,0]-3-nonenes
    1976, Vol. 41, Issue 5, pp. 1571–1580 [Abstract]
  • J. Protiva and A. Vystrčil
    Reaction of amides of 28-lupanoic acid with lead tetraacetate and iodine mass spectra of 12-lupene derivatives
    1976, Vol. 41, Issue 4, pp. 1200–1207 [Abstract]
  • M. R. Nair, S. Hilgard, J. Klinot, K. Waisser and A. Vystrčil
    Oxidation rates of triterpenoid secondary alcohols with chromic acid
    1976, Vol. 41, Issue 3, pp. 770–779 [Abstract]
  • J. Klinot, M. Hořejší, M. Buděšínský and A. Vystrčil
    Conformation of the ring A in 2,3-disubstituted 24-nortriterpenes and the stereochemistry of the opening of 2β,3β-epoxides
    1975, Vol. 40, Issue 12, pp. 3712–3727 [Abstract]
  • V. Pouzar, J. Protiva, E. Lisá, E. Klinotová and A. Vystrčil
    Reaction of 20-lupanol derivatives with lead tetraacetate
    1975, Vol. 40, Issue 10, pp. 3046–3054 [Abstract]
  • E. Klinotová, J. Beneš and A. Vystrčil
    Oxidative cleavage of 22-hydroxymethylene-21-ketones of the 20,28β-epoxy-18α,19βΗ-ursane series
    1975, Vol. 40, Issue 9, pp. 2861–2868 [Abstract]
  • J. Beneš
    Investigation of soil-solution systems on the capture of radioiodine in relation to pH
    1975, Vol. 40, Issue 7, pp. 2012–2019 [Abstract]
  • J. Klinot, V. Richtr and A. Vystrčil
    Conformation of ring A of 2,3-disubstituted triterpenes with chlorine or alkoxy group in the position 2
    1975, Vol. 40, Issue 6, pp. 1758–1767 [Abstract]
  • J. Vokoun and Z. Řeháček
    Mass spectra of ergot peptide alkaloids
    1975, Vol. 40, Issue 6, pp. 1731–1737 [Abstract]
  • A. Vystrčil, V. Křeček and M. Buděšínský
    Photooxidation of (20R)- and (20S)-29-lupanol derivatives
    1975, Vol. 40, Issue 5, pp. 1593–1603 [Abstract]
  • J. Klinot, M. Buděšínský, M. Kliment, S. Hilgard and A. Vystrčil
    Conformation of ring A of 1,2-disubstituted triterpenes. Geometry and stability of the boat form
    1975, Vol. 40, Issue 5, pp. 1426–1440 [Abstract]
  • K. Waisser, J. Urban and A. Vystrčil
    Synthesis of anagadiol
    1975, Vol. 40, Issue 2, pp. 452–456 [Abstract]
  • J. Klinot, M. Buděšínský, S. Hilgard and A. Vystrčil
    The effect of 8β-methyl group on the conformation of the ring of a 2,3-disubstituted triterpenes
    1974, Vol. 39, Issue 12, pp. 3741–3755 [Abstract]
  • J. Klinot, M. Kliment and A. Vystrčil
    Preparation and stereochemistry of 1,2- and 2,3-bromohydrins, bromo ketones, epoxides and diols of triterpenes
    1974, Vol. 39, Issue 11, pp. 3357–3373 [Abstract]
  • A. Vystrčil and V. Pouzar
    Functionalization of the lupane skeleton through Barton's reaction
    1974, Vol. 39, Issue 11, pp. 3304–3316 [Abstract]
  • S. Hilgard, M. Horák and A. Vystrčil
    Formation and stabilization energy of very weak collision complexes of alcohols and carboxylic acid monomers with non-polar solvents
    1974, Vol. 39, Issue 11, pp. 3215–3223 [Abstract]
  • A. Vystrčil, V. Křeček and M. Buděšínský
    Elimination reaction of the angular hydroxymethyl group of the lupane skeleton
    1974, Vol. 39, Issue 11, pp. 3131–3143 [Abstract]
  • A. Vystrčil and V. Pouzar
    Functionalisation of the lupane skeleton using Barton's reaction
    1974, Vol. 39, Issue 10, pp. 2961–2974 [Abstract]
  • J. Beneš, J. Frána and A. Maštalka
    Determination of iodine in soil by the instrumental neutron activation analysis
    1974, Vol. 39, Issue 10, pp. 2783–2786 [Abstract]
  • A. Vystrčil, V. Křeček and M. Buděšínský
    Elimination reactions on angular hydroxymethyl group of the lupane skeleton
    1974, Vol. 39, Issue 9, pp. 2494–2506 [Abstract]
  • A. Vystrčil and J. Protiva
    Photo-oxidation of 28-lupanol and its derivatives
    1974, Vol. 39, Issue 5, pp. 1382–1390 [Abstract]
  • A. Vystrčil, V. Pouzar and V. Křeček
    Triterpenes. XXXII. Absolute configuration at C(20) in 29-substituted lupane derivatives
    1973, Vol. 38, Issue 12, pp. 3902–3911 [Abstract]
  • A. Vystrčil and Z. Blecha
    Triterpenes. XXXI. Absolute configuration at C(20) in 30-nor-20ξ-lupanol derivatives
    1973, Vol. 38, Issue 12, pp. 3648–3661 [Abstract]
  • K. Waisser, S. Hilgard, A. Zelenka and A. Vystrčil
    Triterpenes. XXX. Study for the synthesis of glochidiol
    1973, Vol. 38, Issue 11, pp. 3521–3531 [Abstract]
  • J. Tax, P. Sedmera, J. Vokoun, K. Eckardt, I. Komersová and Z. Vaněk
    ε1-Pyrromycinone, a new anthracyclinone from Streptomyces galilaeus JA 3043
    1973, Vol. 38, Issue 9, pp. 2661–2664 [Abstract]
  • J. Klinot, E. Úlehlová, R. Straka and A. Vystrčil
    Triterpenes. XXIX. 3,4-Seco acids of 18α-oleanane series with modified side chain at C(5)
    1973, Vol. 38, Issue 9, pp. 2648–2657 [Abstract]
  • E. Klinotová, N. Hovorková, J. Klinot and A. Vystrčil
    Triterpenes. XXVIII. Stereochemistry of dehydration of isomeric 20-hydroxy-30-norderivatives of lupane
    1973, Vol. 38, Issue 4, pp. 1179–1189 [Abstract]
  • M. Horák and A. Vystrčil
    The low-temperature infrared spectrum of the s-trans form of benzalacetone
    1973, Vol. 38, Issue 4, pp. 1156–1158 [Abstract]
  • K. Waisser, M. Buděšínský, A. Vítek and A. Vystrčil
    Triterpenes. XXVII. Conformational analysis of the A-cycle of 1,3-dihydroxy derivatives of pentacyclic triterpenoids
    1972, Vol. 37, Issue 11, pp. 3652–3659 [Abstract]
  • E. Klinotová and A. Vystrčil
    Triterpenes. XXVI. Participation of oxygen-containing groups in position 28 in the addition of bromine to the double bond of 20(21)-taraxastene derivatives
    1972, Vol. 37, Issue 6, pp. 1883–1893 [Abstract]
  • E. Klinotová, I. Škarková and A. Vystrčil
    Triterpenes. XXV. Isomerisation of 20α,21α-epoxy-28-benzoyloxy derivatives of taraxastane
    1972, Vol. 37, Issue 5, pp. 1748–1754 [Abstract]
  • J. Klinot, M. Buděšínský and A. Vystrčil
    Triterpenes. XXIV. Migration of the side chain during the acid catalysed isomerisation of unsaturated 3,4-seco derivatives
    1972, Vol. 37, Issue 4, pp. 1356–1370 [Abstract]
  • A. Vystrčil and Z. Blecha
    Triterpenes. XXIII. Dehydrogenation of derivatives of 20(29)-lupene with mercuric acetate III. Dehydrobetulinic acid
    1972, Vol. 37, Issue 2, pp. 624–636 [Abstract]
  • A. Vystrčil and Z. Blecha
    Triterpenes. XXII. Dehydrogenation of derivatives of 20(29)-lupene with mercuric acetate II. Degradation of the side chain
    1972, Vol. 37, Issue 2, pp. 610–623 [Abstract]
  • J. Klinot, V. Šumanová and A. Vystrčil
    Triterpenes. XXI. 3,4-Seco derivatives of betulinic acid
    1972, Vol. 37, Issue 2, pp. 603–609 [Abstract]
  • J. Klinot, K. Waisser, L. Streinz and A. Vystrčil
    Triterpenes. XX. The participation of dimethylformamide in the addition of halogens to the Δ2-double bond - A way to the preparation of β-epoxides
    1970, Vol. 35, Issue 12, pp. 3610–3617 [Abstract]
  • A. Vystrčil and Z. Blecha
    Triterpenes. XIX. Dehydrogenation of 20(29)-lupene derivatives with mercuric acetate
    1970, Vol. 35, Issue 11, pp. 3309–3319 [Abstract]
  • J. Klinot, N. Hovorková and A. Vystrčil
    Triterpenes. XVIII. Oxidation of the isopropenyl group with peracids
    1970, Vol. 35, Issue 4, pp. 1105–1119 [Abstract]
  • J. Beneš
    Precipitation and coprecipitation in the presence of chelating agents. VII. Coprecipitation of strontium with calcium oxalate precipitated from an EDTA-containing solution
    1970, Vol. 35, Issue 2, pp. 591–597 [Abstract]
  • A. Vystrčil and M. Buděšínský
    Triterpenes. XVII. Preparation of new 19αH-lupane derivatives
    1970, Vol. 35, Issue 1, pp. 312–320 [Abstract]
  • A. Vystrčil and M. Buděšínský
    Triterpenes. XVI. Unusual epimerisation of the C(19)-acetyl group of 20-oxo-30-norlupane derivatives
    1970, Vol. 35, Issue 1, pp. 295–311 [Abstract]
  • J. Beneš
    Precipitation and coprecipitation in the presence of chelating agents. VI. Falling-out of alkali earths oxalates in EDTA
    1969, Vol. 34, Issue 9, pp. 2545–2552 [Abstract]
  • J. Kaválek, J. Beneš, J. Socha, F. Brtník and M. Večeřa
    Nucleophile Reaktivität der 3'- und 4'-substituierten 3-Nitro-4-chlorazobenzole
    1969, Vol. 34, Issue 7, pp. 2092–2100 [Abstract]
  • M. Kyrš, V. Michaluková, J. Beneš and L. Kadlecová
    Extraction of strontium and calcium ions into nitrobenzene in the presence of polyiodides
    1969, Vol. 34, Issue 6, pp. 1709–1719 [Abstract]
  • J. Beneš, M. Vobecký and K. Bárta
    Precipitation and coprecipitation in the presence of chelating agents. V. The contamination of barium chromate by uranium fission products in EDTA
    1969, Vol. 34, Issue 5, pp. 1523–1532 [Abstract]
  • J. Beneš
    Precipitation and coprecipitation in the presence of chelating agents. IV. Precipitation of barium chromate from EDTA
    1969, Vol. 34, Issue 5, pp. 1514–1522 [Abstract]
  • J. Beneš, J. Kaválek, J. Bartošek and J. Churáček
    Kinetics and mechanism of non-catalysed condensation of 2-picoline with benzaldehyde
    1969, Vol. 34, Issue 3, pp. 819–832 [Abstract]
  • E. Říhová and A. Vystrčil
    Triterpenes. XV. A 2nd order Beckmann rearrangement of 20β,28-epoxytaraxastane 21- and 22-oximino derivatives
    1969, Vol. 34, Issue 1, pp. 240–246 [Abstract]
  • J. Beneš and M. Kyrš
    The coprecipitation of trace amounts of strontium with barium chromate
    1968, Vol. 33, Issue 9, pp. 2822–2832 [Abstract]
  • K. Waisser, J. Zelinka and A. Vystrčil
    Triterpenes. XIV. The stereochemistry of 1-hydroxytriterpenes
    1968, Vol. 33, Issue 8, pp. 2485–2493 [Abstract]
  • J. Klinot, E. Úlehlová and A. Vystrčil
    Triterpenes. XIII. Performic acid oxidation of isopropenyl group in 3,4-secotriterpenes
    1967, Vol. 32, Issue 8, pp. 2890–2897 [Abstract]
  • J. Klinot, E. Říhová and A. Vystrčil
    Triterpenes. XII. Preparation of 18α,19βH-ursan-28,20β-olide (taraxastanolide)
    1967, Vol. 32, Issue 3, pp. 1276–1279 [Abstract]
  • J. Beneš and M. Vobecký
    Precipitation and coprecipitation in the presence of EDTA. III. Coprecipitation of calcium with strontium sulfate
    1967, Vol. 32, Issue 3, pp. 1269–1273 [Abstract]
  • K. Waisser, A. Vystrčil and A. Vítek
    Triterpenes. XI. Infra-red absorption of triterpenic 1-hydroxy derivatives
    1966, Vol. 31, Issue 12, pp. 4741–4743 [Abstract]
  • J. Beneš and M. Kyrš
    Fällung und Mitfällung in Gegenwart von Äthylendiamintetraessigsäure II. Ausscheiden von Strontiumsulfat
    1966, Vol. 31, Issue 11, pp. 4405–4411 [Abstract]
  • J. Beneš and M. Vobecký
    Precipitation and coprecipitation in the presence of EDTA. I. Effect of the conditions on the precipitation of radioactive barium and strontium by the sulfate method
    1966, Vol. 31, Issue 11, pp. 4398–4404 [Abstract]
  • K. Waisser and A. Vystrčil
    Triterpenes. X. Preparation of 1-hydroxy-19β,28-epoxy-18αH-olean-2-enes
    1966, Vol. 31, Issue 8, pp. 3182–3188 [Abstract]
  • J. Kinot, M. Krumpolc and A. Vystrčil
    Triterpenes. IX. Reaction of isomeric 2,3-epoxides with Grignard reagent
    1966, Vol. 31, Issue 8, pp. 3174–3181 [Abstract]
  • E. Říhová and A. Vystrčil
    Triterpenes. VIII. Intramolecular epoxidation in ring E; Hydroxy derivatives of 20β,28- and 21β,28-epoxytaraxastane
    1966, Vol. 31, Issue 8, pp. 3163–3173 [Abstract]
  • J. Klinot and A. Vystrčil
    Triterpenes. VII. Stereochemistry of 2-bromo derivatives of allobetuline and alloheterobetuline
    1966, Vol. 31, Issue 3, pp. 1079–1092 [Abstract]
  • J. Křepinský, V. Herout, F. Šorm, A. Vystrčil, R. Prokeš and G. Jommi
    Plant substances. XXIII. The structure of sarcodontic acid
    1965, Vol. 30, Issue 8, pp. 2626–2630 [Abstract]
  • J. Beneš
    Zum Mechanismus der Substitutionsreaktionen in heterogenem Medium
    1965, Vol. 30, Issue 7, pp. 2164–2178 [Abstract]
  • J. Beneš, M. Dobiášová and K. Vereš
    Synthesis of methylmalonic acid-14CH3; Side reactions in the alkylation of ethyl malonate
    1964, Vol. 29, Issue 12, pp. 3178–3181 [Abstract]
  • J. Beneš
    Grenzflächenspannung im System organisches halogenid-wässrige Natriumhydroxidlösung
    1964, Vol. 29, Issue 12, pp. 3102–3107 [Abstract]
  • A. Vystrčil and E. Říhová
    Über Triterpene VI. Intramolekulare Epoxydierung im Triterpenring E; Darstellung von 21β,28-Oxido-taraxastan-Derivaten
    1964, Vol. 29, Issue 10, pp. 2377–2388 [Abstract]
  • J. Klinot and A. Vystrčil
    Nebenprodukte bei der Umsetzung von Allobetulin zu Heterobetulin
    1964, Vol. 29, Issue 2, pp. 516–530 [Abstract]
  • J. Beneš
    Zum Wirkungsmechanismus der Antioxydantien bei der Oxydation von Polypropylen
    1964, Vol. 29, Issue 2, pp. 363–373 [Abstract]
  • R. Zahradník and A. Vystrčil
    Study of aurones. III. Attempt for theoretical explanation of formation of benzofuran derivative from aurone
    1963, Vol. 28, Issue 5, pp. 1334–1338 [Abstract]
  • J. Beneš
    Zum Mechanismus der Reaktion von Chloramin B mit Bis(2-chloräthyl)sulfid
    1963, Vol. 28, Issue 5, pp. 1171–1176 [Abstract]
  • A. Holý and A. Vystrčil
    Studie der Aurone II. Über die Reaktivität der Carbonylgruppe in Auronen
    1962, Vol. 27, Issue 8, pp. 1861–1869 [Abstract]
  • J. Klinot and A. Vystrčil
    Beckmannsche Umlagerung von Triterpen-3-ketoximen
    1962, Vol. 27, Issue 2, pp. 377–386 [Abstract]
  • J. Beneš, V. Chvalovský and V. Bažant
    Organosiliciumverbindungen XXVI. Einfluss der struktur auf die oxydationsgeschwindigkeit der methylphenylsiloxane
    1961, Vol. 26, Issue 6, pp. 1627–1635 [Abstract]
  • J. Beneš, V. Chvalovský and V. Bažant
    Organosiliciumverbindungen XXV. Einfluss der struktur auf die oxydationsgeschwindigkeit der methylphenylsilane
    1961, Vol. 26, Issue 6, pp. 1617–1626 [Abstract]
  • A. Vystrčil, E. Stejskalová-Vondrášková and J. Černý
    Über die identität von graciolon und betulinsäure
    1959, Vol. 24, Issue 10, pp. 3279–3286 [Abstract]
  • A. Vystrčil and J. Klinot
    Struktur des alloheterobetulins
    1959, Vol. 24, Issue 10, pp. 3273–3278 [Abstract]
  • S. Scholle, Z. Uhlíř and J. Beneš
    Löslichkeitsdiagramm des systems NaJ-NaBr-H2O
    1959, Vol. 24, Issue 3, pp. 987–988 [Abstract]
  • A. Vystrčil and J. Černý
    Modellverbindungen des physostigmins
    1959, Vol. 24, Issue 3, pp. 804–808 [Abstract]
  • V. Bažant and J. Beneš
    Organosiliciumverbindungen XV. Darstellung linearer methylphenyltetrasiloxane
    1959, Vol. 24, Issue 2, pp. 624–629 [Abstract]
  • L. Stárka and A. Vystrčil
    Polarographie der anthronderivate in eisessig
    1958, Vol. 23, Issue 2, pp. 216–220 [Abstract]
  • L. Stárka, A. Vystrčil and B. Stárková
    Polarographie der Anthrachinonderivate in Eisessig
    1958, Vol. 23, Issue 2, pp. 206–215 [Abstract]
  • L. Stárka and A. Vystrčil
    Die chromatographische trennung einiger anthrachinonderivate
    1957, Vol. 22, Issue 5, pp. 1686–1688 [Abstract]
  • B. Stárková, A. Vystrčil and L. Stárka
    Darstellung von nitroderivaten des carbazols mittels der Graebe-Ullmannschen synthese
    1957, Vol. 22, Issue 3, pp. 1019–1022 [Abstract]
  • C. Párkányi and A. Vystrčil
    Untersuchungen in der Thiochinazolonreihe III. Synthese und Desulfurierung von 1-Methyl-2-thio-3-phenyl-1,2-dihydrochinazolon-(4)
    1956, Vol. 21, Issue 6, pp. 1657–1658 [Abstract]
  • C. Párkányi and A. Vystrčil
    Untersuchungen in der Thiochinazolon-Reihe I. Über die Desulfurierung einiger 2-Thiochinazolon-(4)-derivate mit Raney-Nickel
    1956, Vol. 21, Issue 4, pp. 1007–1012 [Abstract]
  • C. Párkányi and A. Vystrčil
    Polarographie der Harnstoff- und Thioharnstoffderivate VIII. Anodische Depolarisation in Lösungen einiger 2-Mercaptochinazolone-(4)
    1956, Vol. 21, Issue 3, pp. 689–696 [Abstract]
  • A. Vystrčil and K. Kalfus
    Darstellung von 3-(β-indolyl)-buttersäure aus 1-hydroxy-2-carbazol-carbonsäure
    1954, Vol. 19, Issue 1, pp. 179–181 [Abstract]